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package com.st.BlueSTSDK.Utils;

/**
 * Class that help to unwrap the timestamp
 *
 * @author STMicroelectronics - Central Labs.
 * @version 1.0
 */
public class UnwrapTimestamp {

    private static final int NEAR_TO_END_TH =(1<<16)-100;

    /** number of time that the ts has reset, the timestamp is reset when we receive a ts with
     * a  value > 65435 and than a package with a smaller value */
    private int mNReset=0;
    /** last raw ts received from the board, it is a number between 0 and 2^16-1 */
    private int mLastTs=0;

    synchronized public long getNext(){
        return unwrap(mLastTs+1);
    }

    /**
     * If necessary it adds a multiple of (1&lt;&lt;16) for hide the timestamp reset
     * @param ts timestamp
     * @return unwrapped timestamp
     */
    synchronized public long unwrap(int ts){
        if(mLastTs>(NEAR_TO_END_TH) && mLastTs > ts)
            mNReset++;
        mLastTs=ts;
        return (long)mNReset * (1<<16) + (long)ts;
    }


}
